Coke breaker for underfeed stokers



R. S. RILEY ET AL Y COKE BREKER FOR yUNDERFEED sToKERs Aug. 3 .1926;

, Filed Sept- 18 1920 2 Sheets-Sheet' 1 /3 ador-,muys

Aug. 3,1926, 1,594,559

,. R. S. RILEY ET AL- l COKE BREAKER FOR UNDERFEED SITO-KEES File d Sept. 18, 1920 2 Sheets-Sheet 2 l' l Emmy A l @m0771118 ies l Patented Aug. 3, 1926.

sToKER oo., oF WORCESTER, MASSACHUSETTS, a

COKE BREAKER FOR UNDER/FEED STOKERS.

Application filed September 18, 1920. f Serial No. 411,052.

This invention relates to a device for breaking masses of coke or other material in the retorts of an underfeed stoker. Certain fuels and particularly certain kinds of soft or bituminous coal have a decided tendency to become massed into large bodies of coke or coke-like material which cannot be properly consumed in the passage through the stoker.

It is the general object of our invention to provide a device positively movable through the fuel in the retort and effective to break up such masses of fuel and thus facilitate complete combustion thereof.

In the preferred form, our invention consits of a pivotally supported movable member for each retort, intermittently but positively moved about its pivot to swing upward through the fuel in the retort. This member is preferably in the form of a plate and a further feature of our inventionv relates to the provision of means to prevent leakage of fuel past said plate.

Our invention further relates to the provision of suitable driving means for the movable members and to other arrangements and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

A preferred form of our invention is 'shown in the drawings, in which- Fig. 1 is underfeed ments;

Fig. 2 is an enlarged sectional rear elevation of certain parts shown in Fig. 1;

Fig. 3 is an enlarged sectional elevation taken along the line 3-3 in Fig. 2, and

Fig. 4 is a partial plan view of one form of driving connections. y

Referring to the drawings, we have shown parts of an underfeed stoker of a usual type, having a front wall 10, a rear wall 11, a feed hopper 12, a ram 13 for forcing the coa-l from the hopper to the retort, a crankshaft 14 for reciprocating the ram 13 and a gear boX 15 through which the crankshaft is driven from a drive shaft not shown. At the rear of the retort a rocking discharge plate 16 continues the rearward movement of the ash and waste to the discharge opening 17. The furnace is commonly divided into a plurality of parallel rearwardly inclined retorts each having side walls 18 and a botstoker embodying our improve- 'hln the drawings, we

a sectional side elevation of an ciprocated longitudinally to `assist rearward movement of the fuel. Y

. in the All of the parts thusfar described-maybe no part of the usual construction and 'form' of our invention. n

In applying our invention to an underfeed stoker of this type, ing 20 through each bottom plate/19. A shaft 21 is mounted in bearings 22below the retorts jand extendsytransversely of the seriesof retorts. Coke breaking members, preferably in the formofplates 23, are fixed to the shaft 21' by mean-s of flanges 24 or in any other suitable manner. Each plate 23 extends upwardly through the opening 20 in one of the bottom plates 19 and is preferably of the general outline .shown in the drawings.

Any suitable driving connection may be provided for rocking the shaft 2l to provide an upward slicing movement of the plate 23.

on the end of the shaft 21, connected by a link 26 to a bell crank 27 mounted on a fixed bearing 28 and connected by a second link 29 to a crank pin 30 on the crankshaft 14 from which the ram 13 is driven.

As the crank shaft 14 rotates, each plate 23 is rocked from the position shown in` dotted lines in Fig. 3 to the position shown in full lines in said figure. The upper edge of each plate is thus givenan upward slicing movement through the 'fuel bed and acts effectively to break up any masses of coke or other material found therein.

Guard plates 3l are preferably mounted on the bottom plates 19 and engage the rocking plates 23 on each side thereof, thus preventing leakage of fuel through the openings 20 as as the plates move downward. These guard plates are loosely bolted to the flanges or lips around the openings 20 so that the pressure of the fuel in the retorts forces the Lipper edges of the against the rocking plates 23 and thus maintains a close lit which prevents fine fuel from sifting 'through the openings as the plates 23 are moved up and down.

Having thus described our invention, it will be seen that we have provided a very guard plates simple and efficient mechanism for subject` ing the fuel to a slicing action effective to break up any large masses found therein.

we provide a'y slotor open-y have shown an arm y wise limited to conformation with, respect to its Our improved coke breaker is found to materially aid the `complete combustion of cer-- tain kinds of coke-forming fuel.

tions can be vmade in our invention within the spirit and vscope thereof as set forth in the claims, and we do not wish to be otherthe details herein disclosed, but what we claim is 1. In an underfeed Stoker, aretort having a bottom having a narrow opening therein, a platedike member movably supported in said Stoker", and means to move said member upward through said narrow opening in said retort bottom to slioe the fuel in said retort said platelike member 'being of such path of movement thaty it lslides freely and idly through the lfuel in said retort on its return downward i movement and substantially without disturbing said fuel.

'2. In an underfeed Stoker, a retort having 'a bottom having a narrow opening therein a plate-like member 'mov'ably supported in'r It will be also evident that changes. and modificasaid stolzer, and means to ward the fuel receiving end of said retort throughv said narrow opening in said bottom to slice the fuel insaid retort, ,said plate-like member being of such Conformation with respect to its path of movement that it slides freely and idly through the fuel in said retort on its return downward movement '.nd substantially without disturbing said uel.

3. In an underfeed Stoker, a retort having a bottom with a narrow opening therein, a member supported below said reto-rt and movable upward throughv said opening, means to move said member to lslice the fuel in the retort, "and guard plates engaging the sides of said member to prevent leakage of fuel past said member.

In testimony whereof we have hereunto affixed our signatures.

i ROBERT SANFORD RILEY.

f CARL H. RICH.

positively move said member upwardly and forwardly to-v 

